[U-Boot] SPI question

Hello,

Veteran developer, new to Linux internals. I'm working with the BeagleBone and need three SPI ports. I'm now working to enable the second chip select on the second port. I need some basic information to get started.

Is the port initialization done in u-boot or in the kernel? In beagle/beagle.h I found the pins nicely enumerated but that file is apparently for the BeagleBoard, as it doesn't get built during a bone build.

If the initialization is done in u-boot, could someone suggest the file to look at?

Thanks,

John